feat(sops): trigger service restarts on secret rotation

Wire up restartUnits on secrets whose consumers cache them in memory
(daemons read at startup), so sops-nix restarts the affected unit on
activation when the decrypted content changes:

- firefly: app_key → phpfpm-firefly-iii;
  auto_import_secret + access_token → phpfpm-firefly-iii-data-importer
- searx: secret_key → uwsgi
- opencode: web password → opencode-serve
- mail: sasl_passwd → postfix
- forgejo: gitea_dbpass → forgejo; runner-token → gitea-runner-default

Secrets read on demand by oneshots/timers (firefly sparda_pin, ntfy
token, restic backup creds, acme dns creds, wg conf) are left as-is.

systems/x86_64-linux/sgx/firefly.nix

@@ -31,6 +31,7 @@ in
     "firefly/app_key" = {
       sopsFile = ../../../.secrets/sgx/firefly.yaml;
       owner = "firefly-iii";
+      restartUnits = [ "phpfpm-firefly-iii.service" ];
     };
     "firefly/sparda_pin" = {
       sopsFile = ../../../.secrets/sgx/firefly.yaml;
@@ -39,10 +40,12 @@ in
     "firefly/auto_import_secret" = {
       sopsFile = ../../../.secrets/sgx/firefly.yaml;
       owner = "firefly-iii-data-importer";
+      restartUnits = [ "phpfpm-firefly-iii-data-importer.service" ];
     };
     "firefly/access_token" = {
       sopsFile = ../../../.secrets/sgx/firefly.yaml;
       owner = "firefly-iii-data-importer";
+      restartUnits = [ "phpfpm-firefly-iii-data-importer.service" ];
     };
   };
 

systems/x86_64-linux/sgx/mail.nix

@@ -21,6 +21,7 @@
   sops.secrets.sasl_passwd = {
     sopsFile = ../../../.secrets/sgx/relay.yaml; # bring your own password file
     owner = config.services.postfix.user;
+    restartUnits = [ "postfix.service" ];
   };
 
 }

systems/x86_64-linux/sgx/opencode.nix

@@ -42,5 +42,6 @@ in
   sops.secrets.opencode-web-password = {
     sopsFile = ../../../.secrets/sgx/opencode-web.yaml;
     owner = user;
+    restartUnits = [ "opencode-serve.service" ];
   };
 }

systems/x86_64-linux/sgx/searx.nix

@@ -1,6 +1,9 @@
 { pkgs, config, ... }:
 {
-  sops.secrets."searx/secret_key".sopsFile = ../../../.secrets/sgx/searx.yaml;
+  sops.secrets."searx/secret_key" = {
+    sopsFile = ../../../.secrets/sgx/searx.yaml;
+    restartUnits = [ "uwsgi.service" ];
+  };
 
   services.searx = {
     enable = true;